Sharecroppers worked on farms and they were provided the farm by a man. The man would take 1/2 the crops and they must sell the other 1/2 to pay rent and other needs. Yeah paying rent even though they give 1/2 the crops. Awfull isnt it? Just like slavery your stuck in an endless work cycle.
Two congruent triangles are polygons which have the same angles, number of sides and measurement of the lengths. This means the height and the legs of the triangle has the same measurements. When the two are superimposed to each other, the answer would have to be C
The significance of the Magna Carta was that D) It gave certain rights to English nobility that the King had to respect.
Civilization? I don't know the song/poem, so according to what ai have here this is my best guess...
Sorry I can't hell more!